list-capabilities

Since 3.8.

This command returns the full list of supported capabilities offered by the watchman server. The intention is that client applications will use the expanded version command to check compatibility rather than interrogating the full list.

Here's some example output. The actual capabilities list is in unspecified order and is much longer than is reproduced here:

$ watchman list-capabilities
{
    "version": "3.8.0",
    "capabilities": [
        "field-mode",
        "term-allof",
        "cmd-trigger"
    ]
}